Become a Member

Your membership pays itself back through discounts on products, access to exclusive resources, and educational opportunities. Become a Member

Attend an Event

We promote safety in all that we do. MAC-ISA provides a huge array of educational events. Click below to view all the upcoming events. Register Online

Become Certified

Want to become a Certified Arborist or Tree Worker? Find out which of the ISA certification credentials best meet your needs. Become Certified

Who We Are

The MAC-ISA is a trade association for arborists, urban foresters, and others involved in the caring of trees. Our mission is "to promote a culture of safety while fostering education and research that supports the care and benefits of trees." The chapter area includes District of Columbia, Maryland, Virginia and West Virginia.

News & Announcements

2018 MAC-ISA Annual Meeting

2018 MAC-ISA Annual Meeting on October 8-9 in Frederick, MD was a huge success. We had the largest crowd ever! Thanks to all who planned, participated, volunteered. Thanks to our speakers, sponsors and exhibitors! More coverage including pictures coming in our Fall Canopy Coverage! For a link to Patrick Teague's pictures, click here.

We have REACHED OUR initial FUNDRAISING GOAL OF $100,000 to endow this scholarship! Thanks to all who contributed. Scholarship applications are now accepted by the TREE Fund. https://www.treefund.org/scholarships. We will continue to fundraise to increase the amount of future scholarships. Please donate. Read more on the Tree Fund page under the Bonnie Appleton Fund section.

About MAC-ISA

The MAC-ISA is a not for profit organization for arborists, urban foresters, and others involved in tree care. Our mission is “to promote a culture of safety while fostering education and research that supports the care and benefits of trees.” The chapter area includes District of Columbia, Maryland, Virginia and West Virginia.Read More